CN115014412A - Process variable transmitter with dual compartment housing - Google Patents
Process variable transmitter with dual compartment housing Download PDFInfo
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- CN115014412A CN115014412A CN202210573554.5A CN202210573554A CN115014412A CN 115014412 A CN115014412 A CN 115014412A CN 202210573554 A CN202210573554 A CN 202210573554A CN 115014412 A CN115014412 A CN 115014412A
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- Prior art keywords
- compartment
- process variable
- carrier assembly
- housing
- electronic component
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Software Systems (AREA)
- Automation & Control Theory (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A process variable transmitter for use in an industrial control or monitoring process is provided that includes a housing having a cavity formed therein that extends between a first housing opening and a second housing opening. The transmitter further includes a process variable sensor configured to sense a process variable of the industrial process. An electronic component carrier assembly is mounted in the cavity and is configured to define a first compartment and a second compartment in the cavity and to provide a seal between the first compartment and the second compartment. Measurement circuitry is mounted by the electronic component carrier assembly in the first compartment and is configured to receive the process variable signal and provide an output. The electrical connector is mounted on the electronic component carrier assembly in the second compartment and is electrically connected to an output of the measurement circuit.
Description
The application is a divisional application of an invention application with the application number of 201380079917.9, in which the international application PCT/CN2013/084662 enters the China national stage in 2013, 9 and 30.
Background
The present invention relates to industrial process control or monitoring systems. In particular, the present invention relates to process variable transmitters configured to sense a process variable in the system.
Process variable transmitters are used in industrial process control environments. The transmitter couples to a process fluid to provide measurements related to the process. Process variable transmitters can be configured to monitor one or more process variables associated with fluids in process plants, such as cement, liquid, vapor and gas chemicals, pulp, oil, gas, pharmaceuticals, food, and other fluid processing plants. Exemplary monitored process variables include pressure, temperature, flow, level, acidity or alkalinity, conductivity, turbidity, density, concentration, chemical composition, or other property of the fluid. Typically, process variable transmitters are located at remote locations, typically in the field, and transmit information to a central location, such as a control room. Process variable transmitters sense process variables in a number of applications including oil and gas refineries, chemical storage reservoirs, or chemical processing plants. In many instances, this requires that the process variable transmitter be located in a harsh environment.
Some types of process variable transmitters include a housing that is divided into two separate compartments. One compartment includes circuitry and the other compartment includes a junction box for connection to a process control loop. One such configuration is shown in U.S. patent No. 5,546,804. As shown, the construction includes a housing divided into two separate compartments.
Disclosure of Invention
A process variable transmitter for use in an industrial control or monitoring process is provided and includes a housing having a cavity formed therein extending between a first housing opening and a second housing opening. The transmitter further includes a process variable sensor configured to sense a process variable of the industrial process. An electronic component carrier assembly is mounted in the cavity and is configured to define a first compartment and a second compartment in the cavity and to provide a seal between the first compartment and the second compartment. Measurement circuitry is mounted on the electronic component carrier assembly in the first compartment and is configured to receive the process variable signal and provide an output. The electrical connector is mounted on the electronic component carrier assembly in the second compartment and is electrically connected to an output of the measurement circuit.
Drawings
FIG. 1 is a schematic diagram showing a cross-sectional view of a process variable transmitter including a first chamber and a second chamber according to one embodiment of the present invention.
FIG. 2 is an exploded view of the process variable transmitter of FIG. 1.
FIG. 3 is a schematic diagram similar to FIG. 1 with an illustration showing a seal in the transmitter housing of FIG. 1.
FIG. 4 is a cross-sectional view of a transmitter housing showing another exemplary seal.
FIG. 5 is a front plan view of the transmitter of FIG. 1 showing the junction box connection.
FIG. 6 is a simplified schematic diagram showing circuitry of the transmitter of FIG. 1.
Detailed Description
The present invention provides a process variable transmitter for use in an industrial process, the process variable transmitter including a housing divided into two compartments. The two compartments are defined by an electronic component carrier assembly with measurement circuitry and providing a seal between the two compartments.
FIG. 1 is a simplified schematic diagram illustrating an industrial process control or monitoring system 10 for monitoring or controlling a process fluid in an industrial process. Typically, process variable transmitter 12 is located at a remote location in the field and transmits the sensed process variable back to the centrally located control room 14. Multiple techniques may be used for transmissionThe process variables include wired and wireless communications. One common wired communication technique uses a so-called two-wire process control loop 16 in which a pair of wires is used to carry information and provide power to transmitter 12. One technique for transmitting information is to control the current level through process control loop 16 between 4mA and 20 mA. Current values in the 4-20mA range can be mapped to corresponding values of the process variable. An exemplary digital communication protocol includes
(hybrid physical layer consisting of digital communication signals superimposed on standard 4-20mA analog signals), FOUNDATION TM Fieldbus (all-digital communication protocol promulgated by the american society of instruments), fieldbus communication protocol, or others. Such as comprising
The wireless protocol of the radio frequency communication technology of (1) may also be implemented.
According to one embodiment, process variable transmitter 12 includes a probe 14, probe 14 extending into process piping 18 and configured to measure a process variable of a process fluid in process piping 18. Exemplary process variables include pressure, temperature, flow, level, acidity or alkalinity, conductivity, turbidity, density, concentration, chemical composition, and the like. Process variable transmitter 12 includes a housing 20 having a cavity 40 formed therein, cavity 40 extending between circular openings at opposite ends of housing 20, the circular openings configured to receive end caps 24 and 26. End caps 24 and 26 are threadably connected to housing 20. In one embodiment, transmitter 12 includes display circuitry 22 sealed in cavity 40 by end cap 24.
Single compartment process variable transmitters are known. The transmitter typically has an electronics module mounted on a transmitter disk placed inside a housing, the transmitter disk including terminal connections. However, in a single compartment configuration, when the cover is removed, the internal electronics and other fragile components are exposed to the process environment. Thus, some prior art configurations use a two-compartment configuration in which the transmitter housing is divided into a first compartment and a second compartment by a partition that is integral with the housing and formed of one piece with the housing.
As shown in fig. 1, transmitter 12 includes an electronic carrier assembly 30 mounted in a cavity 40. In this embodiment, the electronic component carrier 30 includes a terminal cover 27, the terminal cover 27 defining a first compartment 50 and a second compartment 52 in the cavity 40 and providing a seal between the first compartment 50 and the second compartment 52. The measurement circuit 23 is mounted in the electronic component carrier assembly 30 in the first compartment 50. Measurement circuitry 23 is configured to receive a process variable signal from a process variable sensor and provide an output. An electrical connector (not shown in fig. 1) is mounted on the terminal cover 27 in the second compartment 52 and may be used, for example, to connect to a process variable sensor, such as a temperature sensor mounted in the probe 14. The electrical connections are electrically connected to measurement circuitry 23 and provide transmitter output on process control loop 16.
A seal is disposed between the lip 34 of the electronic carrier assembly 30 and the housing 20 and seals the first compartment 50 from the second compartment 52. A sealant filled between the electronic component carrier 30 and the housing 20 may be used or other techniques may be used to form the seal. The sealant may be made of a suitable material to provide a seal, such as rubber. In one embodiment, the seal comprises an O-ring seated around the interior of the housing 20. In a configuration with an O-ring, the seal may be secured in place between the lip 34 of the electronic carrier 30 and the housing 20 using a securing mechanism such as a screw or the like.
FIG. 2 is an exploded view of one embodiment of process variable transmitter 12 illustrating housing 20, display 22, end caps 24 and 26, and electronics carrier assembly 30. As shown in fig. 2, the electronic component carrier assembly 30 includes a measurement circuit 23, a display interface cover 25, and a terminal cover 27. Terminal cover 27 provides a physical barrier between compartments 50 and 52. The measurement circuit 23 is sandwiched between the covers 25 and 27 and is located in the first compartment 50. The display circuitry 22 may, for example, be configured for insertion into the display interface cover 25 shown in fig. 2. For example, the components may include a multi-pin connector to provide electrical communication therebetween, and feet (22A shown in fig. 2) may be received in the terminal cover 25 to provide a secure mounting. Alternative attachment techniques, such as screws, adhesives, etc., may be used. As described in more detail below, the carrier assembly 30 has a flanged configuration and forms a seal in the housing 20 to divide the cavity into two separate compartments 50, 52 in the housing 20. Fig. 2 also illustrates an optional transient protection circuit 29 that may be mounted to the terminal cover 27. Circuitry 29 may, for example, prevent transients from process control loop 16 or other connections from entering measurement circuitry 23.
Fig. 3 shows transmitter 12 and includes an inset portion, illustrated at 100, that better illustrates the seal formed between lip 34 of electronics carrier assembly 30 and lip 60 of housing 20. The lip 34 is pressed against the housing lip 60 by the carrier lip 102. Insert 100 also illustrates an O-ring gasket 104 positioned between lip 60 and lip 34. Fig. 4 is a cross-sectional view of another exemplary embodiment of transmitter 12 using gasket 104 shaped as a partial disk positioned between housing lip 60 and lip 34 of electronic carrier 30. Additionally, in fig. 4, electrical connections 105 are shown, the electrical connections 105 extending between terminals in the second compartment 52 (illustrated in fig. 5) and the measurement electronics 23.
FIG. 5 is a front plan view of transmitter 12 showing terminals 120 positioned in compartment 52. Terminals 120 are mounted in the terminal block side compartment 52 of the electronic carrier assembly 30 and are configured for connection to the process control loop 16. The terminal block side of the electronic carrier assembly 30 also preferably carries sensor terminals 130 configured for connection to a process variable sensor 154 (not shown in fig. 5), such as a temperature sensor mounted on the probe 14. In the configuration shown in fig. 5, the terminal block side of the carrier 30 can be accessed in the compartment 52 by removing the cover 26 without exposing the measurement circuitry 23 or the display circuitry 22 to the process environment. This allows an operator to access sensor holes 133 whereby wiring connected to probes 14 can be electrically connected to terminals 130 and loop holes 135 whereby connectors 120 can be connected to process control loop 16. The holes 133 and 135 are formed as openings through the housing 20. Fig. 5 also illustrates screws 132 for securing the electronic component carrier assembly 30 in the housing 20. The screw 132 is used to apply the mounting force to the lips 60 and 102 and thereby provide a seal between the compartments 50 and 52.
FIG. 6 is a simplified block diagram of one exemplary embodiment of process variable transmitter 12 showing measurement circuitry 23 in greater detail. As shown in fig. 6, the measurement circuit 23 is positioned in the first compartment 50 and includes a microprocessor 150 that operates according to instructions installed in a memory 152. Microprocessor 150 is connected to process variable sensor 154 through an analog-to-digital converter 156 and sensor terminal 130 positioned in second compartment 52. Sensor 154 can be any type of process variable sensor including, for example, a temperature sensor. Microprocessor 150 is connected to process control loop 16 through input/output circuitry 160 and terminals 120 located in compartment 50. I/O circuitry 160 is also configured to generate power for the drive circuitry 22, 23 from power derived from the two wire process control loop 16.
As schematically shown in fig. 6, electronics carrier assembly 30 divides transmitter housing 20 into chambers 50 and 52. Measurement circuitry 23 and optional display 22 are positioned in cavity 50 while terminals 120, 130 are positioned in cavity 52. As described above, end cap 26 can be removed from transmitter housing 20, whereby terminals 120, 130 and cavity 52 can be accessed by an operator. This can be used, for example, to couple transmitter 12 to two-wire process control loop 16 through a loop aperture and to couple measurement circuitry 23 to process variable sensor 154 through sensor aperture 133.
Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. The electronic component carrier may be made of any suitable material. In one particular embodiment, the electronic carrier is made of plastic and the housing 20 and end caps 24, 26 are made on metal such as die cast aluminum. The measurement circuit 23 may be connected to an optional display 22. In this configuration, end cap 24 can be configured to include a transparent region whereby the display can be viewed from outside transmitter housing 20. Although O-rings, gaskets, and sealants have been described, any suitable sealing technique may be used to seal the electronic component carrier 30 to the inner wall of the housing 20. In the example illustrated herein, the circumferential lip 102 of the electronic carrier 30 pushes against the circumferential lip 60 of the housing 20 to provide a seal between the circumferential lip 102 and the circumferential lip 60. The seal prevents harsh environmental factors, such as liquids, dust and dirt, etc., from reaching the electronic circuitry mounted in the compartment 50. The measuring circuit 23 may be mounted on a separate component or may be mounted directly by the electronic carrier. In one example, the connectors extending through the carrier assembly 30 are formed by brass pins that are overmolded with plastic. This configuration does not require additional cold end compensation when the thermocouple sensor is used.
Claims (24)
1. A process variable transmitter for use in an industrial process, the process variable transmitter comprising:
a housing (20) having a cavity (40) formed therein, the cavity (40) extending between a first opening and a second opening of the housing (20);
a first end cap (24) and a second end cap (26) received over the first opening and the second opening, respectively, of the housing (20);
a process variable sensor (154) configured to sense a process variable of an industrial process;
an electronic component carrier assembly (30), the electronic component carrier assembly (30) comprising:
a first lid (25) and a second lid (27), wherein a first compartment (50) is provided by an interior space enclosed by the first lid (25) and the second lid (27); and
measurement circuitry (23) carried on the electronic component carrier assembly in a first compartment (50) and configured to receive a process variable signal from the process variable sensor and provide an output; and
wherein the electronic component carrier assembly (30) is mounted in the cavity enclosed by the housing (20) and the first and second end caps (24, 26) and is configured to define the second compartment (52) using the housing (20) and second cover (27), the second end cap (26), the second compartment (52) being external to the electronic component carrier assembly, a seal being provided between the first compartment (50) and the second compartment (52),
wherein the process variable transmitter (12) further includes an electrical connection (105) carried on the electronics carrier assembly in the second compartment and electrically connected to an output of the measurement circuitry in the first compartment, the electrical connection providing a transmitter output,
wherein the second end cap (26) is detachably attached to a second opening, wherein in a state in which the attached second end cap (26) is detached, the electrical connection is accessible through the second opening without exposing the measurement circuitry (23) to a process environment.
2. The process variable transmitter of claim 1 wherein the first end cap (24) and the first cover (25) define a third compartment.
3. The process variable transmitter of claim 2 wherein the cavity (40) is removably partitioned into the second and third compartments by the electronics carrier assembly (30).
4. The process variable transmitter of claim 1 wherein the seal is formed between a lip on the electronics carrier assembly and a lip of the housing.
5. The process variable transmitter of claim 1 wherein the electronics carrier assembly comprises plastic.
6. The process variable transmitter of claim 1 and further comprising: and a sealant filled between the electronic component carrier assembly and the housing.
7. The process variable transmitter of claim 1 and further comprising: an O-ring between the electronic component carrier assembly and the housing.
8. The process variable transmitter of claim 1 and further comprising: a display (22) connected to the measurement circuitry in the first compartment.
9. The process variable transmitter of claim 8 wherein: a display (22) is mounted to a first cover (25) of the electronic component carrier assembly and is received in the cavity.
10. The process variable transmitter of claim 1 and further comprising: a mounting screw configured for urging the electronic component carrier assembly against the housing (20).
11. The process variable transmitter of claim 1 and further comprising: a sensor connector carried on the electronic carrier assembly in the second compartment, the sensor connector configured to electrically connect the measurement circuitry to the process variable sensor.
12. The process variable transmitter of claim 1 wherein: the process variable sensor includes a temperature sensor.
13. The process variable transmitter of claim 1, comprising: a rubber gasket disposed between the electronic component carrier assembly and the housing, the rubber gasket being configured to provide a seal between the first compartment and the second compartment.
14. The process variable transmitter of claim 1 wherein the housing includes a sensor aperture for accessing the second compartment.
15. A method for a process variable transmitter in an industrial process, the method comprising:
forming a cavity extending between the first opening and the second opening of the housing;
providing first and second end caps (24, 26) received over the first and second openings of the housing (20), respectively, wherein the second end cap (26) is removably attached to the second opening;
mounting an electronic component carrier assembly (30) in the cavity enclosed by the housing (20) and the first and second end caps (24, 26), wherein the electronic component carrier assembly (30) is configured to define a first compartment (50) and a second compartment (52) in the cavity and to provide a seal between the first compartment (50) and the second compartment (52), the electronic component carrier assembly (30) comprising a first cover (25) and a second cover (27), wherein a first compartment (50) is located in an interior space enclosed by the first cover (25) and the second cover (27), and the second compartment (52) is located outside the electronic component carrier assembly, wherein in a state where the attached second end cap (26) is detached, the electrical connection is accessible through the second opening without exposing the measurement circuitry (23) to a process environment;
sensing a process variable of the industrial process using a process variable sensor (154);
receiving the sensed process variable using measurement circuitry (23) located in the first compartment (50); and
the transmitter output is provided using an electrical connection (105) carried on the electronic carrier assembly in the second compartment, the electrical connection being electrically connected to the measurement circuitry in the first compartment.
16. The method of claim 15, wherein the first end cap (24) and the first cover (25) define a third compartment.
17. The method of claim 16 wherein the cavity (40) is removably separated into the second compartment (52) and the third compartment by the electronic carrier assembly (30).
18. The method of claim 15 including placing a gasket between the electronic component carrier assembly and the housing.
19. The method of claim 15, comprising connecting a display (22) to the measurement circuit.
20. The method of claim 18 including urging the electronic component carrier assembly against the housing (20) to form a seal.
21. The method of claim 18 including connecting the measurement circuitry to the process control loop using a connector located on an electronic carrier assembly carried in the second compartment.
22. The method of claim 15 including connecting the measurement circuitry to the process variable sensor using a connector located on an electronic carrier assembly carried in the second compartment.
23. A process variable transmitter (12) for use in an industrial process, the process variable transmitter (12) comprising:
a cavity (40), said cavity (40) extending between a first opening and a second opening of a housing (20) and being closed by said housing (20) and by said first and second end caps (24, 26), said first and second end caps (24, 26) being received over the first and second openings of said housing (20), respectively;
an electronic component carrier device (30) for defining a first compartment and a second compartment in the cavity;
means for sealing the electronic component carrier means to the housing to seal the first compartment from the second compartment;
means (154) for sensing a process variable of an industrial process;
means (23) in the first compartment for receiving a sensed process variable; and
means for providing a transmitter output using an electrical connection carried on the electronic carrier assembly (30) in the second compartment, the electrical connection being electrically connected to means (23) for receiving a sensed process variable in the first compartment,
wherein the electronic component carrier arrangement comprises a first cover (25) and a second cover (27), wherein a first compartment (50) is located in an inner space enclosed by the first cover (25) and the second cover (27), and wherein a second compartment (52) is located outside the electronic component carrier assembly,
wherein the second end cap (26) is detachably attached to a second opening, wherein in a state in which the attached second end cap (26) is detached, the electrical connection is accessible through the second opening.
24. The process variable transmitter of claim 23 and further comprising: a connector device connected to a device (154) for sensing a process variable of the industrial process, wherein the connector device is positioned in the second compartment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210573554.5A CN115014412A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210573554.5A CN115014412A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
| CN201380079917.9A CN105593646A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
| PCT/CN2013/084662 WO2015042929A1 (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380079917.9A Division CN105593646A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115014412A true CN115014412A (en) | 2022-09-06 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210573554.5A Pending CN115014412A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
| CN201380079917.9A Pending CN105593646A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380079917.9A Pending CN105593646A (en) | 2013-09-30 | 2013-09-30 | Process variable transmitter with dual compartment housing |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9971316B2 (en) |
| EP (1) | EP3052899B1 (en) |
| JP (1) | JP2016533480A (en) |
| CN (2) | CN115014412A (en) |
| RU (1) | RU2636814C2 (en) |
| WO (1) | WO2015042929A1 (en) |
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-
2013
- 2013-09-30 JP JP2016518191A patent/JP2016533480A/en active Pending
- 2013-09-30 EP EP13894160.4A patent/EP3052899B1/en active Active
- 2013-09-30 US US14/237,476 patent/US9971316B2/en active Active
- 2013-09-30 CN CN202210573554.5A patent/CN115014412A/en active Pending
- 2013-09-30 WO PCT/CN2013/084662 patent/WO2015042929A1/en active Application Filing
- 2013-09-30 CN CN201380079917.9A patent/CN105593646A/en active Pending
- 2013-09-30 RU RU2016116897A patent/RU2636814C2/en active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3052899B1 (en) | 2020-10-28 |
| US9971316B2 (en) | 2018-05-15 |
| JP2016533480A (en) | 2016-10-27 |
| CN105593646A (en) | 2016-05-18 |
| RU2016116897A (en) | 2017-11-10 |
| RU2636814C2 (en) | 2017-11-28 |
| WO2015042929A1 (en) | 2015-04-02 |
| EP3052899A4 (en) | 2017-05-17 |
| EP3052899A1 (en) | 2016-08-10 |
| US20150094826A1 (en) | 2015-04-02 |
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